:root{color-scheme:light dark;--primary:#006d64;--on-primary:#fff;--container:#d4f4e4;--on-container:#064c40;--secondary:#e0ebe4;--bg:#f7faf7;--surface:#f0f5f0;--text:#17251f;--muted:#506159;--border:#c8d5cc;--error:#a72727;--error-bg:#ffdad6;--gold:#b99a5c;--shadow:0 3px 14px #15291c14;font:16px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}
@media(prefers-color-scheme:dark){:root{--primary:#80d8c4;--on-primary:#00382f;--container:#144f43;--on-container:#baf0db;--secondary:#31483f;--bg:#101914;--surface:#17221c;--text:#e0ebe2;--muted:#bacbc0;--border:#3c4e43;--error:#ffb4ab;--error-bg:#572221;--shadow:0 3px 14px #0004}}
@keyframes reveal-card{from{transform:rotateY(0)}to{transform:rotateY(180deg)}}
@keyframes cover-card{from{transform:rotateY(180deg)}to{transform:rotateY(0)}}
.memory-card.revealing .memory-inner{animation:reveal-card .36s ease both}
.memory-card.covering .memory-inner{animation:cover-card .36s ease both}
@media(prefers-reduced-motion:reduce){.memory-card .memory-inner{animation:none!important}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}button,input,select{font:inherit}button{cursor:pointer;color:inherit;border:1px solid var(--border);background:var(--surface);border-radius:18px;min-height:48px;padding:10px 16px;line-height:1.35;transition:background .15s,transform .15s}button:hover:not(:disabled){filter:brightness(.96);border-color:var(--primary)}button:active:not(:disabled){transform:scale(.98)}button:disabled{opacity:.48;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--primary);outline-offset:3px}input,select{width:100%;min-height:48px;border:1px solid var(--border);border-radius:12px;padding:10px 12px;background:var(--bg);color:var(--text)}label{display:block;font-weight:600;font-size:.92rem;margin:12px 0 5px}a{color:var(--primary)}h1,h2,h3,p{margin:0}h1{font-size:clamp(1.8rem,6vw,2.45rem);line-height:1.2;letter-spacing:-.025em;margin:8px 0 12px}h2{font-size:1.22rem;line-height:1.35}h3{font-size:1.02rem}p+p{margin-top:10px}small,.small{font-size:.82rem;line-height:1.5}.muted{color:var(--muted)}.eyebrow{font-size:.76rem;letter-spacing:.16em;font-weight:700;color:var(--primary);text-transform:uppercase}.heading{margin-bottom:24px}.stack{display:grid;gap:14px}.row{display:flex;gap:12px;align-items:center}.between{justify-content:space-between}.wrap{flex-wrap:wrap}.grow{flex:1;min-width:0}.primary{background:var(--primary);color:var(--on-primary);border-color:var(--primary);font-weight:650}.outline{background:transparent;border-color:var(--primary);color:var(--primary)}.text-button{border:0;background:transparent;color:var(--primary);padding:8px 10px}.full{width:100%}.card{background:var(--surface);border-radius:22px;padding:20px}.hero,.prompt{background:var(--container);color:var(--on-container)}.hero{padding:24px}.hero h2{font-size:1.6rem;line-height:1.25;margin:10px 0}.hero p{margin-top:12px}.prompt{border-radius:24px;padding:18px}.prompt h2{font-size:1.6rem;font-weight:500;margin-top:10px;overflow-wrap:anywhere}.latin{font-family:Georgia,serif}.section{margin-top:24px}.lesson{width:100%;display:flex;gap:16px;text-align:left;align-items:center;background:transparent;padding:18px;margin-top:12px}.lesson.selected{border:2px solid var(--primary);padding:17px}.lesson-icon{background:var(--secondary);padding:10px 14px;border-radius:14px;color:var(--primary);font-size:1.35rem}.lesson strong{display:block}.lesson small{display:block;color:var(--muted);margin-top:4px}.tick{color:var(--primary);font-weight:bold}.choices{display:grid;gap:10px}.direction{display:flex;text-align:left;align-items:center;gap:12px}.direction.selected{background:var(--secondary);border-color:var(--primary)}.radio{width:18px;height:18px;border:2px solid var(--muted);border-radius:50%;margin-left:auto;flex-shrink:0}.selected .radio{border:5px solid var(--primary)}.account-name{font-size:.84rem;color:var(--muted);overflow-wrap:anywhere}.logo{width:64px;height:64px}.auth{max-width:480px;margin:auto}.auth-tabs{display:flex;gap:8px;margin:24px 0 16px}.auth-tabs button{flex:1}.auth .card{padding:24px}.auth .small{margin-top:18px}.form-message{color:var(--error);margin:12px 0}.help{font-size:.83rem;color:var(--muted)}.help summary{cursor:pointer;color:var(--primary);padding:8px 0}.help p{padding:8px 0}.quiz{display:grid;gap:12px}.quiz-header button{padding-left:0}.counter{font-size:.88rem;color:var(--muted)}.options{display:grid;gap:10px}.option{display:flex;gap:16px;text-align:left;padding:16px;align-items:center;font-size:1.06rem}.option .letter{width:24px;color:var(--muted);font-size:.92rem;font-weight:700}.option.correct{background:var(--container);border-color:var(--primary);color:var(--on-container);opacity:1}.option.wrong{background:var(--error-bg);border-color:var(--error);opacity:1}.feedback{padding:16px;border-left:3px solid var(--primary);border-radius:6px;background:var(--surface)}.feedback.wrong{border-color:var(--error)}.feedback h2{color:var(--primary);margin-bottom:8px}.feedback.wrong h2{color:var(--error)}.picture-prompt{text-align:center;display:grid;justify-items:center;gap:8px}.picture-frame{border:2px solid var(--gold);background:var(--container);border-radius:26px;padding:10px;box-shadow:var(--shadow);width:204px;height:204px}.picture-frame img{background:#fff;border:1px solid #e0d4b9;border-radius:17px;padding:8px;width:100%;height:100%;object-fit:contain}.picture-prompt .small{color:var(--muted)}.tiles{display:flex;gap:8px;flex-wrap:wrap;align-content:flex-start}.answer-box{min-height:78px;padding:12px;border-radius:18px;background:var(--surface)}.tile{min-width:44px;min-height:46px;border-radius:12px;padding:9px 13px;user-select:none}.selected-tile{display:inline-flex;border-radius:12px;background:var(--secondary);border:1px solid var(--border);align-items:center;touch-action:pan-y}.selected-tile>button{border:0;background:transparent;border-radius:10px;padding:8px;min-width:32px;min-height:44px}.selected-tile .tile{padding:8px 11px}.selected-tile.dragging{outline:2px solid var(--primary);opacity:.6}.tile-arrow{font-size:.75rem;color:var(--primary)}.spelling-preview{font-size:1.55rem;overflow-wrap:anywhere}.sticky-action{position:fixed;bottom:0;left:0;right:0;background:var(--bg);box-shadow:0 -3px 12px #0001;padding:8px max(16px,calc((100vw - 648px)/2)) max(10px,env(safe-area-inset-bottom));z-index:10}.sticky-action button{width:100%}.filters{display:flex;flex-wrap:wrap;gap:8px}.filter{border-radius:10px;padding:6px 12px;min-height:42px;font-size:.9rem}.filter.selected{background:var(--secondary);border-color:transparent;font-weight:600}.metrics{display:grid;grid-template-columns:1fr 1fr;gap:12px}.metric{border-radius:24px;padding:20px;background:var(--surface)}.metric strong{display:block;font-size:1.7rem;color:var(--primary);margin-bottom:6px}.metric span{font-size:.85rem;color:var(--muted)}.overview p{display:flex;justify-content:space-between}.overview small{display:block;margin:12px 0}.chart{height:160px;display:grid;grid-template-columns:repeat(7,1fr);gap:5px;align-items:end;margin-top:16px}.day-bar{display:flex;flex-direction:column;align-items:center;justify-content:end;height:100%;border:0;border-radius:8px;padding:5px 2px;background:transparent;min-width:0}.bars{display:flex;flex-direction:column-reverse;justify-content:start;width:22px;max-width:100%;height:110px}.bar-correct{background:var(--primary);border-radius:5px 5px 0 0}.bar-wrong{background:var(--error);border-radius:5px 5px 0 0}.day-count,.day-label{font-size:.72rem}.day-label{margin-top:6px;color:var(--muted)}.difficult-item{border:1px solid var(--border);border-radius:18px;padding:16px}.difficult-item h3{overflow-wrap:anywhere}.daily-group{padding:12px 0;border-bottom:1px solid var(--border)}.memory-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}.memory-card{perspective:700px;background:transparent;padding:0;border:0;min-height:96px;aspect-ratio:.8;min-width:0;border-radius:12px}.memory-inner{display:block;width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .36s}.memory-card.up .memory-inner{transform:rotateY(180deg)}.memory-front,.memory-back{position:absolute;inset:0;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;border:1px solid var(--gold);border-radius:12px;overflow:hidden}.memory-back{background:repeating-linear-gradient(45deg,transparent 0 15px,#e5c88412 16px 17px),repeating-linear-gradient(-45deg,transparent 0 15px,#e5c88412 16px 17px),linear-gradient(120deg,#123f42,#16786a,#103d43);color:#e5c884}.memory-back:before{content:"";position:absolute;inset:8px;border:1px solid #e5c88488;border-radius:8px}.memory-back svg{width:74%;fill:none;stroke:currentColor;stroke-width:2}.memory-front{transform:rotateY(180deg);background:var(--surface);flex-direction:column;padding:5px;font-size:.8rem;line-height:1.3;overflow-wrap:anywhere;gap:6px}.memory-front small{color:var(--primary);font-size:.62rem;font-weight:700}.memory-front .card-text{display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}.memory-card.found .memory-front{background:var(--container);border:2px solid var(--primary)}.memory-card:disabled{opacity:1}.memory-card:hover:not(:disabled){filter:none}.memory-card:active:not(:disabled){transform:none}.big-card{font-size:1.65rem;text-align:center;padding:24px 0;overflow-wrap:anywhere}.round-summary{font-size:1.1rem}.loading{text-align:center;margin:60px 16px}#app{max-width:680px;margin:0 auto;padding:28px 24px 108px;min-height:100dvh}#navigation{position:fixed;bottom:0;left:0;right:0;background:var(--surface);display:flex;justify-content:center;padding-bottom:env(safe-area-inset-bottom);z-index:8;border-top:1px solid var(--border)}#navigation:empty{display:none}#navigation button{border:0;border-radius:0;background:transparent;flex:1;max-width:190px;padding:10px 5px;font-size:.78rem;color:var(--muted)}#navigation .nav-icon{display:block;font-size:1.25rem;width:58px;margin:0 auto 3px;border-radius:20px;line-height:1.7}#navigation .active .nav-icon{background:var(--secondary);color:var(--primary)}#notice{position:fixed;top:12px;left:50%;transform:translateX(-50%);width:min(90vw,600px);padding:14px 18px;border-radius:14px;background:var(--text);color:var(--bg);z-index:40;box-shadow:var(--shadow)}#notice:empty{display:none}dialog{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:24px;padding:24px;width:min(94vw,600px);max-height:85dvh;overflow:auto}dialog::backdrop{background:#0008}dialog h2{margin-bottom:14px}#close-modal{width:100%;margin-top:20px}.busy{cursor:progress}.busy button{pointer-events:none}.busy #app{opacity:.85}@media(max-height:700px){.picture-frame{width:168px;height:168px}#app{padding-top:16px}.quiz .prompt{padding:14px}.quiz .prompt h2{font-size:1.4rem}.quiz{gap:10px}}@media(min-width:850px){body{background:linear-gradient(140deg,var(--secondary),var(--bg) 45%);background-attachment:fixed}#app{background:var(--bg);box-shadow:0 0 70px #00000008;min-height:100dvh}.auth{padding-top:30px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}